package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
   @Value("${reggie.path}")
    private String basePath;
    /**
     * 文件上传
     */
    @PostMapping("/upload")
    public R upload(MultipartFile file){
        //log.info(file.toString());
        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用uuid，重新生成文件名,防止文件名相同被覆盖
        String filename = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()){
            //不存在就创建
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
      return R.success(filename);
    }
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
      //输入流，通过输入流读取文件内容
        try {
            FileInputStream fis = new FileInputStream(new File(basePath + name));
            //输出流，通过输出流将文件写回给浏览器
            ServletOutputStream os = response.getOutputStream();
           // response.setContentType("image/jpeg");

            int len=0;
            byte[] bytes = new byte[1024];
            while ((len=fis.read(bytes))!=-1){
                os.write(bytes,0,len);
                os.flush();
            }
            //关闭资源
            os.close();
            fis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
